22 calibers are legal in Utah, and I have known some hunters who use them. But I would highly recomend a minimun .243, and even it should have a premium bullet. I don't even use the small calibers on the small Texas whitetails. The 22's will kill like lighting, if all things are perfect, but things are not always perfect in the field. I know I am goin to catch some flak for this,just my 2 cents worth.